linux-stable/arch/sh/mm/cache-debugfs.c
Greg Kroah-Hartman 03eb2a08fc sh: no need to check return value of debugfs_create functions
When calling debugfs functions, there is no need to ever check the
return value.  The function can work or not, but the code logic should
never do something different based on this.

Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Rich Felker <dalias@libc.org>
Cc: <linux-sh@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-03 15:39:40 +02:00

120 lines
2.8 KiB
C

/*
* debugfs ops for the L1 cache
*
* Copyright (C) 2006 Paul Mundt
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <asm/processor.h>
#include <linux/uaccess.h>
#include <asm/cache.h>
#include <asm/io.h>
enum cache_type {
CACHE_TYPE_ICACHE,
CACHE_TYPE_DCACHE,
CACHE_TYPE_UNIFIED,
};
static int cache_seq_show(struct seq_file *file, void *iter)
{
unsigned int cache_type = (unsigned int)file->private;
struct cache_info *cache;
unsigned int waysize, way;
unsigned long ccr;
unsigned long addrstart = 0;
/*
* Go uncached immediately so we don't skew the results any
* more than we already are..
*/
jump_to_uncached();
ccr = __raw_readl(SH_CCR);
if ((ccr & CCR_CACHE_ENABLE) == 0) {
back_to_cached();
seq_printf(file, "disabled\n");
return 0;
}
if (cache_type == CACHE_TYPE_DCACHE) {
addrstart = CACHE_OC_ADDRESS_ARRAY;
cache = &current_cpu_data.dcache;
} else {
addrstart = CACHE_IC_ADDRESS_ARRAY;
cache = &current_cpu_data.icache;
}
waysize = cache->sets;
/*
* If the OC is already in RAM mode, we only have
* half of the entries to consider..
*/
if ((ccr & CCR_CACHE_ORA) && cache_type == CACHE_TYPE_DCACHE)
waysize >>= 1;
waysize <<= cache->entry_shift;
for (way = 0; way < cache->ways; way++) {
unsigned long addr;
unsigned int line;
seq_printf(file, "-----------------------------------------\n");
seq_printf(file, "Way %d\n", way);
seq_printf(file, "-----------------------------------------\n");
for (addr = addrstart, line = 0;
addr < addrstart + waysize;
addr += cache->linesz, line++) {
unsigned long data = __raw_readl(addr);
/* Check the V bit, ignore invalid cachelines */
if ((data & 1) == 0)
continue;
/* U: Dirty, cache tag is 10 bits up */
seq_printf(file, "%3d: %c 0x%lx\n",
line, data & 2 ? 'U' : ' ',
data & 0x1ffffc00);
}
addrstart += cache->way_incr;
}
back_to_cached();
return 0;
}
static int cache_debugfs_open(struct inode *inode, struct file *file)
{
return single_open(file, cache_seq_show, inode->i_private);
}
static const struct file_operations cache_debugfs_fops = {
.owner = THIS_MODULE,
.open = cache_debugfs_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int __init cache_debugfs_init(void)
{
debugfs_create_file("dcache", S_IRUSR, arch_debugfs_dir,
(void *)CACHE_TYPE_DCACHE, &cache_debugfs_fops);
debugfs_create_file("icache", S_IRUSR, arch_debugfs_dir,
(void *)CACHE_TYPE_ICACHE, &cache_debugfs_fops);
return 0;
}
module_init(cache_debugfs_init);
MODULE_LICENSE("GPL v2");